Prince of Persia: The Sands of Time
16 Achievements
8-10h
One Hard Decision
Defeat your father Details for this achievement will be revealed once unlocked
40.8%
How to unlock the One Hard Decision achievement in Prince of Persia: The Sands of Time - Definitive Guide
Once you return to the room where you activated the hourglass to meet up with Farah, you will have to fight your sand-father, defeat him and the trophy is yours.
Here is a video showing how.
This is story related and cannot be missed.
A short while after you have travelled up through the open courtyard area you will end up in the palace room where you first began this of the castle section. Once you are back in here you will be attacked by a bunch of enemies yet again. One of these enemies is your father. Simply get rid of the others first and finish your father off last as obviously he is the strongest. I found that he blocked all normal sword attacks, I was only able to hit him when I ran and jump over him then hit him in his back with my sword. Do that a couple of times and he will go down.
This can actually be quite challenging, so make full use of the small pools of water at the back of the room. Drinking the water with will restore some of your health.